GN 342.1

Levelling elements

SKU: 8177 Category:
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Technical Drawing

Product Details

Standard Elements Main dimensions Threaded hole Wrench l2 compression [N/mm²] Area [mm²] damping insert Static load # Weight
Description D d1 l1 l3 d h s 0 0.4 0.6 [N] g
GN 342.1-32-M10-SV 32 30 29 11 M10 10.5 16 5.5 4.3 3.4 707 280 65
GN 342.1-40-M12-SV 40 38 30 9.5 M12 11.5 18 6 4.8 3.9 1134 450 100
GN 342.1-50-M12-SV 50 48 30.5 9 M12 11.5 18 6.5 5.3 4.4 1809 720 137
GN 342.1-60-M16-SV 60 58 37.5 10 M16 16 24 7 5.8 4.9 2641 1050 275
#See technical data

Additional information

Ball joint

Zinc-plated steel, blue passivated, threaded.

Base

Zinc-plated steel, blue passivated.

Damping element

PUR-elastomer (Sylomer V12), grey colour, glued into the base housing, resistant to oil and to temperatures from -30° C to +70° C.

Example

Assume a load per levelling foot: 400 N.<BR>Compression levelling foot D = 32<BR><U>400 N</U> <BR>707 mm² = 0,57 N/mm²<BR>Compression levelling foot D = 40<BR><U>400 N</U> <BR>1134 mm² = 0,34 N/mm²<BR>Therefore levelling feet with D=40, that exert a pressure of 0.4 N/mm<SUP>2 </SUP>should be preferred.<BR>The above graph shows: <BR>Resonant frequency with compression 0.34 N/mm<SUP>2</SUP>: 19 Hz.<BR>The lower graph shows:<BR>Degree of isolation at 66 Hz interference frequency (P1): 90%<BR>Degree of isolation at 98 Hz interference frequency (P2): 97%<BR>At approximately 200 Hz interference frequency the degree of isolation is 100%.

Hexagon nut

Zinc-plated steel, blue passivated.

Order information

The levelling element is supplied assembled.

Technical data

The load values in the table below represent the limit which the damping insert can withstand permanently.<BR>The static load equals a thrust on the area by 0.4 N/mm<SUP>2</SUP>, at which the damping material reaches its optimum dynamic damping ability. This also takes into consideration an additional load of 0.6 N/mm<SUP>2 </SUP>in case of a dynamic load.<BR>When using GN 342.1 ball joint levelling elements the following differentiation in vibration absorption is made:<BR>- active vibrations: vibrations transmitted to surroundings or associated equipment from working machinery for example.<BR>- passive vibrations: vibrations transmitted to equipment or parts from vibrating surroundings or bases.<BR>The efficiency of vibration absorption depends on the interference frequency of the vibration to be absorbed as well as on the resonant frequency of the damping element itself.<BR>A vibration absorbing effect is only achieved when the interference frequency is greater than √<STRONG>2 </STRONG>times the resonant frequency of the damping element. The greater the difference (<STRONG>∆</STRONG>) between the two, the better is the damping effect. The resonant frequency of the damping pad depends on the type (composition) of the material cross section and the static load.<BR>The Vibration absorption – Performance graphs show all required data of standard material (SV12) of the damping pad. Damping materials with other absorption properties are available on request.

Additional Technical Drawing